Added README.md (#16)

* docs(PSG-4350): added README.md

* fix: fixed bottom logo

README.md

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+![Passage Swift](https://storage.googleapis.com/passage-docs/passage-github-banner.png)
+
+# Passage Swift
+
+![SPM Version](https://img.shields.io/github/v/release/passageidentity/passage-swift?style=flat&label=Swift%20Package)
+![Cocoapods Version](https://img.shields.io/github/v/release/passageidentity/passage-swift?style=flat&label=CocoaPods)
+
+![Language](https://img.shields.io/badge/Swift-informational?style=flat&logo=swift&logoColor=white&color=FA7343)
+![Platforms](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fpassage-swift%2Fpassage-swift%2Fbadge%3Ftype%3Dplatforms)
+![Company](https://img.shields.io/badge/1Password-informational?style=flat&logo=1password&logoColor=white&color=3B66BC)
+![License](https://img.shields.io/github/license/passageidentity/passage-swift.svg?style=flat)
+
+ <br />
+
+## ⚙️ Installation
+### Swift Package Manager
+To install via Swift Package Manager, enter this url Xcode's Swift Package Manager's search bar:
+```
+https://github.com/passageidentity/passage-swift
+```
+
+### CocoaPods
+To install via Cocoapods, add this dependency to your Podfile:
+``` ruby
+pod 'PassageSwift'
+```
+
+ <br />
+
+## 👩🏽‍💻 Example Usage
+Below is an example of how easy it is to use Passage Swift to register a new user with a passkey and get their auth token:
+
+``` swift
+import Passage
+
+let passage = Passage(appId: "YOUR_PASSAGE_APP_ID")
+
+try await passage.passkey.register(identifier: "[email protected]")
+
+let authToken = passage.tokenStore.authToken
+```
+
+ <br />
+
+## 🚀 Get Started
+### Visit our 📚 [Passage Swift Docs](https://docs.passage.id) to get started adding Passage to your Swift app.
+ <br />
+
+---
+<br />
+<p align="center">
+  <picture>
+    <source media="(prefers-color-scheme: light)" srcset="https://storage.googleapis.com/passage-docs/logo-small-light.pngg" width="150">
+    <source media="(prefers-color-scheme: dark)" srcset="https://storage.googleapis.com/passage-docs/logo-small-dark.png" width="150">
+    <img alt="Passage Logo" src="https://storage.googleapis.com/passage-docs/logo-small-light.png" width="150">
+  </picture>
+</p>
+
+<p align="center">Give customers the passwordless future they deserve. To learn more check out <a href="https://passage.1password.com">passage.1password.com</a></p>
+
+<p align="center">This project is licensed under the MIT license. See the <a href="./LICENSE"> LICENSE</a> file for more info.</p>